CAREER: Revealing the characteristics of high Reynolds number wakes with rotation

职业：揭示高雷诺数旋转尾流的特征

基本信息

批准号：
1652583
负责人：
Marcus Hultmark
金额：
$ 55万
依托单位：
Princeton University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-03-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1652583&HistoricalAwards=false
关键词：
CAREER Revealing characteristics Reynolds number

项目摘要

This project aims to reveal and characterize the behavior of the flow behind large rotating machines, such as wind or tidal turbines, as well as interactions between such machines. This will be achieved by the combination of a unique experimental flow facility and numerical modeling. Since these machines are typically very large, one needs to accurately account for effects due to inertia and rotation of the flow in model tests and simulations. By using a unique high-pressure flow facility, in combination with state of the art instrumentation, the details of the flow behind a wind turbine will be studied under conditions identical to those of a full scale modern wind or tidal turbine. This work will bridge the gap between previous laboratory research, numerical models, field experiments and the real-world applications, answering open fundamental questions about the scaling of the flow characteristics, as well as the power output and forces acting on the turbine. Furthermore, the numerical component of the project will allow us to perform unique comparisons and evaluation of available models and to improve these modeling approaches further. Improved models can in term result in more cost-efficient designs as well as a better understanding of maintenance guidelines. The primary objective of the proposed research program is to reveal and characterize the morphology and fundamental scaling of wakes generated by rotating machinery over an unprecedented range of Reynolds numbers. The research will enable a unique insight into the details of wakes created by wind and hydrokinetic turbines, which traditionally has not been possible in controlled environments. The combination of high Reynolds numbers and rotation makes attempts to accurately simulate these flows very challenging. The proposed research will combine a recently developed experimental test facility, a custom designed Particle Image Velocimetry system, and novel nanoscale sensors to enable detailed and accurate characterization of the fluid mechanics within rotating wakes. Focus will be aimed at providing knowledge that can improve our ability to model and predict the performance and interactions between these kinds of machines. The proposed research program will permit us to bridge the current gap between previous laboratory research, numerical models, field experiments and the real-world applications, answering open fundamental questions about the scaling and dynamics of the momentum distribution, turbulent fluctuations, structure and meandering of the wake as well as scalability of conventional research efforts.The main objective of the education part of the proposed project is to integrate design into an introductory engineering laboratory course, in order to give the students ownership of the labs and teach them modern engineering tools in an interdisciplinary fashion. The new course will challenge the students to build their own tools and test benches from robust, low cost and open source components to test their ideas and the concepts they have read about. The format of the proposed laboratory course is such that it can be easily adopted by other educators and will be cost efficient.

该项目旨在揭示和表征大型旋转机器（例如风力涡轮机或潮汐涡轮机）背后的流动行为，以及这些机器之间的相互作用。这将通过独特的实验流动设施和数值建模的结合来实现。由于这些机器通常非常大，因此需要在模型测试和模拟中准确地考虑由于流动的惯性和旋转而产生的影响。通过使用独特的高压流动设施，结合最先进的仪器，将在与全尺寸现代风力或潮汐涡轮机相同的条件下研究风力涡轮机后面的流动细节。这项工作将弥合先前的实验室研究、数值模型、现场实验和实际应用之间的差距，回答有关流动特性缩放以及功率输出和作用在涡轮机上的力的开放基本问题。此外，该项目的数值部分将使我们能够对可用模型进行独特的比较和评估，并进一步改进这些建模方法。从长远来看，改进的模型可以带来更具成本效益的设计，并更好地理解维护指南。拟议研究计划的主要目标是揭示和表征旋转机械在前所未有的雷诺数范围内产生的尾流的形态和基本尺度。这项研究将对风力和水力涡轮机产生的尾流细节产生独特的洞察力，这在传统的受控环境中是不可能的。高雷诺数和旋转的结合使得精确模拟这些流动变得非常具有挑战性。拟议的研究将结合最近开发的实验测试设施、定制设计的粒子图像测速系统和新型纳米级传感器，以实现旋转尾流内流体力学的详细而准确的表征。重点将旨在提供知识，以提高我们对此类机器之间的性能和交互进行建模和预测的能力。拟议的研究计划将使我们能够弥合先前实验室研究、数值模型、现场实验和现实应用之间的差距，回答有关动量分布的尺度和动力学、湍流波动、结构和蜿蜒的开放性基本问题。传统研究工作的尾声和可扩展性。拟议项目的教育部分的主要目标是将设计整合到工程实验室入门课程中，以便让学生拥有实验室的所有权，并教他们现代工程工具一种跨学科的时尚。新课程将挑战学生使用强大、低成本和开源组件构建自己的工具和测试平台，以测试他们的想法和他们所读到的概念。拟议的实验室课程的格式可以很容易地被其他教育工作者采用，并且具有成本效益。